Wear performance of additive-manufactured and heat-treated CoCrMo alloy

Abstract

This study examines the wear behavior of additive-manufactured CoCrMo alloy in as-built and heat-treated conditions. Suitable thermal processing modified fine cellular grains and grain-boundary carbides into equiaxed FCC grains and minor HCP phase. With increased load, coefficient of friction declined due to larger contact area and tribo-oxide formation during reciprocating wear experiments. At 10 N, wear is mainly abrasive in the as-built condition, whereas after heat treatment at 1200 degrees C it becomes dominated by stick-slip mode. At 40 N, there is a transition to delamination, ploughing, and subsurface fatigue cracking. Heat-treated samples, despite lower hardness, outperformed at 40 N while exhibiting lower wear rate.Turkiye Cumhuriyeti Kalkinma Bakanlig